I agree - it is better to test later in the day - but make sure you have not eaten or had anythig (but water) to drink for at least an hour. It didn't work in the morning for me - something to do with morning saliva. I am still getting full on ferns everyday ... so I am getting a bit annoyed with it.

Defaintly not going insane sophabulous. Ferning is quite hard to get used to. Im finding it hard with the colder weather trying not to have a warm drink and test. I had a play as well when i first got it. And had differnet results due to putting too much salvia on there, not enough, not letting it dry enough before looking as well.
Combine this with using other methods to detect ovulation such as your BBT, OPks, checking CM etc and it will give you a better chance of working out when you are O and need to BD!
Good LucK